Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Lücke, Óscar H.; Arroyo, Ivonne G.

doi:10.5194/se-6-1169-2015

Cited by 46 publications

(48 citation statements)

References 71 publications

(164 reference statements)

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“…The geophysical evidence from both gravity (Lücke & Arroyo, 2015) and seismic studies (Husen et al, 2003) is consistent with the geochemical evolution of the arc (Gazel et al, 2015), and though results presented here may favor the subduction model. In summary, the Miocene arc depleted in incompatible elements is characterized by normal arc velocities while the modern arc that resulted from the subduction system interaction with Galapagos tracks record seismic velocities and structure similar to continental crust.…”

Section: 1029/2018gc008128supporting

confidence: 82%

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

Gazel

Hayes

Ulloa

et al. 2019

Geochem Geophys Geosyst

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The Talamanca Cordillera in the Central America Arc (Costa Rica‐Panama) preserves the record of the geochemical evolution from an intraoceanic arc to a juvenile continental arc in an active subduction zone, making it a testbed to explore processes that resulted in juvenile continental crust formation and explore potential mechanisms of early continental crust generation. Here we present a comprehensive set of geochronological, geochemical, and petrological data from the Talamanca Cordillera that tracks the key turning point (12–8 Ma) from the evolution of an oceanic arc depleted in incompatible elements to a juvenile continent. Most plutonic rocks from this transition and postintrusive rocks share striking similarities with average upper continental crust and Archean tonalite, trondhjemite, and granodiorite. We complement these data with seismic studies across the arc. Seismic velocities within the Caribbean Plate (basement of the arc) show a relatively uniform lateral structure consistent with a thick mafic large igneous province. Comparisons of seismic velocity profiles in the middle and lower crust beneath the active arc and remnant Miocene arc suggest a transition toward more felsic compositions as the volcanic center migrated toward the location of the modern arc. Seismic velocities along the modern arc in Costa Rica compared with other active arcs and average continental crust suggest an intermediate composition beneath the active arc in Costa Rica closer to average crust. Our geochemical modeling and radiogenic isotopes systematics suggest that input components from melting of the subducting Galapagos hotspot tracks are required for this compositional change.

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Section: 1029/2018gc008128supporting

confidence: 82%

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

Gazel

Hayes

Ulloa

et al. 2019

Geochem Geophys Geosyst

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“…2). La corteza oceánica que se subduce frente a Costa Rica tiene una firma geoquímica contaminada por el punto caliente de Galápagos, lo que generó una segmentación en la subducción, con una losa asís-mica y deshidratada (Lücke y Arroyo, 2015) en el SE de Costa Rica (Fig. 1).…”

Section: Ubicación Geotectónicaunclassified

Geología del cuadrante Tapantí (1:50 000), Costa Rica

Sojo

Denyer

Gazel

et al. 2017

Rev. Geol. Amér. Central

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ABSTRACT:We present a geologic map of the Tapantí quadrangle, which is located in the central region of Costa Rica and belongs to the Central Costa Rica Deformed Belt (CCRDB). The CCRDB is a consequence of the interaction of the Cocos Ridge and the Western edge of the Panama microplate. The oldest rocks mapped in this work are Miocene in age and theyvbelongs to Pacacua, Peña Negra and Coris formations, than form the western edge of the Candelaria basin. Three igneous events were distinguished. First, the Miocene volcanic arc, which is represented by the rocks of La Cruz Formation and the clasts of Pacacua Formation. Another period of igneous activity was recorded in Grifo Alto and Doán formations and the Tapantí Intrusive, with an age range of 0.6-0.03 Ma. From a geochemical point of view is remarkable a change between 10 to 6 Ma, enrichment of K and Si and changes in U, Sr, Ba and La concentrations. This change corresponds with the Cocos Ridge arriving to the Middle America Trench and it is visible because the Pliocene magmatic arc, the Pliocene intrusive of Tapantí and the nowadays volcanic arc. The structural model suggests the existence of two deformation events, the first occurred during the period of time between Late Miocene and Pliocene and it formed the Folding Zone Orosi-Patarrá, and the second one corresponds to the establishment of CCRDB, from Pliocene to present, which is constituted by left lateral faults bearing ENE and right lateral faults bearing NW.

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“…Arroyo, Grevemeyer, Ranero, & von Huene, ; Dzierma, Rabbel, & Thorwart, ; Vannucchi, Morgan, Silver, et al, ). Below the Talamanca area, Lücke and Arroyo () assume a slab with a 50° in angle to a depth of 70 km and 64° for the final section to the depth of 200 km based on gravimetric data.…”

Section: Discussionmentioning

confidence: 99%

“…In southern Costa Rica conditions change from steep subduction to gentler subduction related to the presence of the incoming Cocos Ridge (Corrigan et al, ; Gardner, Fisher, Morell, & Cupper, ; Lücke & Arroyo, ; Protti, Güendel, & McNally, , ). The island arc shows a deformed and uplifting forearc and backarc area, separated by the Talamanca Range with a height of 3.8 km and a width of ~ 80 km (Morell, Kirby, Fisher, & van Soest, ).…”

Section: Tectonic Structure and Terrane Concept Of Southern Central Amentioning

confidence: 99%

From incipient island arc to doubly‐vergent orogen: A review of geodynamic models and sedimentary basin‐fills of southern Central America

Brandes

Winsemann

2018

Island Arc

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Southern Central America is a Late Mesozoic/Cenozoic island arc that evolved in response to the subduction of the Farallón Plate beneath the Caribbean Plate in the Late Cretaceous and, from the Oligocene, the Cocos and Nazca Plates. Southern Central America is one of the best studied convergent margins in the world. The aim of this paper is to review the sedimentary and structural evolution of arc‐related sedimentary basins in southern Central America, and to show how the arc developed from a pre‐extensional intra‐oceanic island arc into a doubly‐vergent, subduction orogen. The Cenozoic sedimentary history of southern Central America is placed into the plate tectonic context of existing Caribbean Plate models. From regional basin analysis, the evolution of the southern Central American island arc is subdivided into three phases: (i) non‐extensional stage during the Campanian; (ii) extensional phase during the Maastrichtian‐Oligocene with rapid basin subsidence and deposition of arc‐related, clastic sediments; and (iii) doubly‐vergent, compressional arc phase along the 280 km long southern Costa Rican arc segment related to either oblique subduction of the Nazca plate, west‐to‐east passage of the Nazca–Cocos–Caribbean triple junction, or the subduction of rough oceanic crust of the Cocos Plate. The Pleistocene subduction of the Cocos Ridge contributed to the contraction but was not the primary driver. The architecture of the arc‐related sedimentary basin‐fills has been controlled by four factors: (i) subsidence caused by tectonic mechanisms, linked to the angle and morphology of the incoming plate, as shown by the fact that subduction of aseismic ridges and slab segments with rough crust were important drivers for subduction erosion, controlling the shape of forearc and trench‐slope basins, the lifespan of sedimentary basins, and the subsidence and uplift patterns; (ii) subsidence caused by slab rollback and resulting trench retreat; (iii) eustatic sea‐level changes; and (iv) sediment dispersal systems.

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Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

Cited by 46 publications

References 71 publications

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

Geología del cuadrante Tapantí (1:50 000), Costa Rica

From incipient island arc to doubly‐vergent orogen: A review of geodynamic models and sedimentary basin‐fills of southern Central America

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